Hypercube-Based SNR-Adaptive Multidimensional Constellation Design for Uplink SCMA Systems.
In: IEEE Transactions on Communications, Jg. 69 (2021), Heft 1, S. 121-132
Online
academicJournal
Zugriff:
Designing multidimensional constellations (MdCs) is an integral part of sparse code multiple access (SCMA). Since the optimal maximum a posteriori (MAP) receiver for SCMA is too complex in most applications, one highly popular technique is the near-optimal message passing algorithm (MPA), where its performance improves with increasing the signal-to-noise ratio (SNR) and the number of iterations. When the number of MPA iterations has to be limited (e.g., low-latency and/or low-complexity and/or energy-sensitive applications), the performance gap between MAP and MPA becomes significant, especially at low-to-medium SNRs. Inspired by the promising features of hypercubes when used along with bit-interleaved coded modulation, we construct novel MdCs which are based on a unitary rotation of a hypercube by a rotation angle that aims to achieve the minimum frame-error-rate (FER). By exploiting special properties of hypercubes, we fit a second-order rational polynomial to a few measured FER samples, and find a close-to-optimal rotation angle at each SNR and MPA iteration. Our proposed MdCs provide substantial performance gains (as much as 2 dB) in comparison to the best known SCMA MdCs in the literature, especially in low-to-medium SNR regions when the number of MPA iterations has to be low, and in the presence of 5G-compliant LDPC codes. [ABSTRACT FROM AUTHOR]
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Titel: |
Hypercube-Based SNR-Adaptive Multidimensional Constellation Design for Uplink SCMA Systems.
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Autor/in / Beteiligte Person: | Vameghestahbanati, Monirosharieh ; Marsland, Ian D. ; Gohary, Ramy H. ; Yanikomeroglu, Halim |
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Zeitschrift: | IEEE Transactions on Communications, Jg. 69 (2021), Heft 1, S. 121-132 |
Veröffentlichung: | 2021 |
Medientyp: | academicJournal |
ISSN: | 0090-6778 (print) |
DOI: | 10.1109/TCOMM.2020.3031624 |
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